Harris, who plays Eve Moneypenny in the James Bond movies Skyfall, Spectre and the forthcoming No Time To Die, provides the voice-over for the animation, which also explores the threat posed by the accelerating loss of species.

"I'm proud to be able to lend my voice to this project, which I hope will inspire viewers to get behind the ambitions of Extinction Rebellion with a great deal of urgency," Harris said in a statement ahead of the film's release on Thursday.

Called We Must Act Now, the film is the first of two animations backed by Hollywood stars to support Extinction Rebellion, which originated in Britain and mobilized thousands of volunteers to peacefully offer themselves for arrest at climate protests last year.

The second film, called Climate Crisis, and Why We Should Panic, is voiced by actress Keira Knightley, and argues for emergency action on global warming.

Read also: Whoopi Goldberg teams with Extinction Rebellion for climate change movie

Hundreds of scientists and academics have backed Extinction Rebellion, saying that civil disobedience is the only option left to force governments to embrace the scale of action needed to prevent millions of deaths due to climate change.

Critics say the movement's disruptive protests, which shut down parts of London last year, have stretched police resources and caused unnecessary inconvenience to commuters.

Nevertheless, the movement has attracted a string of celebrity backers, including Eno, who composed the animation's soundtrack.

In January, Joaquin Phoenix, who won a best actor Oscar this year for his performance in Joker, starred as a medic battling to save planet Earth in a two-minute film to support Extinction Rebellion and San Francisco-based Amazon Watch.